It is possible that interior window treatments and shading devices such as Venetian blinds, draperies, etc. can create a heat trap next to a window that will exacerbate the temperature gradient problem. To alleviate heat trap problems, it has been recommended that there be a minimum of a 2 in. clearance between the window treatment and the glass at all points. In addition, it is recommended that there be a minimum of 1 1/2 in. of clearance at the top and bottom of the window treatment or a minimum of 1 1/2 in. of clearance at the bottom and one side of the window treatment. Finally, it is recommended that all heating and cooling outlets must be to the room side of the window treatment.